Screw-plate.



G. G. RUSSELL.

SCREW PLATE.- APPLICATION FILED SEPT. 25, 191.2. RBKB'WBD JUNE 4. 1913.

1,083,340. Patented Jan. 6, 914.

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CHARLES C. RUSSELL, 0E GREENFIELD, MASSACHUSETTS, ASSIGNOR TO RUSSELLMANUFACTURING COMPANY, OF GREENFIELD, MASSACHUSETTS, A CORPORA- TION OFMASSACHUSETTS.

SCREW-PLATE.

Patented Jan. 6, 1914.

Application filed September 25, 1912, Serial No. 722,305. Renewed June4, 1913. Serial No. 771,732.

To all whom it may concern:

Be it known that I, CHARLES C. RUSSELL, a citizen of the United States,residing at Greenfield, in the county of Franklin and State ofMassachusetts, have invented certain new and useful Improvements inScrew- Plates; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to improvements in screw plates, and it consists inthe constructions, combinations and arrangements herein described andclaimed.

An object of my invention is to provide an improved screw plate havingmeans for automatically unlocking the die -members and quickly shiftingthe latter to open position upon the completion of a thread.

A further object of my invention is to provide an improved screw plate,in which the die members will be automatically closed to an accuratelyadjusted size and locked firmly in position by a single movement of thecollet.

In the accompanying drawings forming a part of this application, and inwhich similar reference symbols indicate corresponding parts in theseveral views :F igure 1 is a rear face view, partly broken away,illustrating one embodiment of my invention with the die-membersadjusted in operative position; Fig. 2 is a similar view showing thedie-members shifted into their open, or inoperative, position; Fig. 3 isa front face view of the construction shown in Figs. 1 and 2; and Fig. 4is a section on the line 44 of Fig. 1.

Referring to the drawings, 1 indicates a stock, or other frame, providedwith cam faces 2 adapted to engage projections 3 on die members 4,slidably mounted in a collet 5 rotatably mounted in said stock. Anysuitable means may be employed for securing a delicate adjustment of thedie-members, such as screwing the threaded pins 3 in or out of the diemembers. A pin 6 is shown threaded in the collet 5 and extending througha slot 7 in the stock for limiting the rotation of said collet; the slot7 being so proportioned that when the pin 6 is in engagement with oneend thereof, the projections 3 will be in engagement with the innerperiphery of the stock at 8 for adjusting the die-members to theiroperative position, and When said pin 6 is in engagement with the otherend of the slot 7, the projections 3 will be in position for engagingthe deepest portions 9 of the cam faces 2 for permitting shifting of thedie-members 4 to their open position.

The pins 6 are shown provided with fiattened sides for fitting the slot7 and adapted to be turned through 180 in enlargements 7* at therespective ends of said slot for looking the collet firmly in position.

Any suitable means maybe employed for maintaining the projections 3 inengagement with the cam faces 2, such as springs 10 confined between theopposite die-members 4; if desired, the springs could be omitted byproviding the projections 8 with offsets fitting within cam grooves inthe stock 1.

A guide 11 is threaded into the collet 5 for clampingly engaging the diemembers 4 to firmly lock the latter in their adjusted position. I haveshown the guide provided with a projection, or tooth, 12 adapted toengage Within a series of recesses 13 formed in. a ring 14, which latteris adjustably locked to the stock 1 by a tapered pointed screw 15engaging a V-shaped slot 16 in said ring. This permits the necessaryslight adjustment of said ring 14 to insure the engagement of the guidetooth 12 within a recess thereof. If desired, any suitable means couldbe formed integral with the stock for lockingly engaging the guide forpreventing rotation of the latter.

From the above description, it will be clear that upon rotation of thecollet from the position shown in Fig. 1, said collet will be screwedupwardly on the guide 11 to release the die-members 4 from the clampingaction of said guide, and the projections 8 will then engage the camfaces 2 to permit shifting of said die-members to their open inoperativeposition. The reverse of this operation takes place when the collet isshifted in the opposite direction.

I have illustrated and described preferred and satisfactoryconstructions, but changes could be made within the spirit and scope ofmy'invention.

I claim:

1. In a screw-cutting device, a stock, a collet rotatably mounted insaid stock, diemembers adjustably mounted in said collet, means forrotating said collet, and independent means for automatically openingand closing said die members and locking the latter in their closedposition upon rotation of said collet.

2. In a screw-cutting device, a stock provided With cam faces, a colletrotatably mounted in said stock, means for rotating said collet, diemembers slidably mounted in said collet and provided with projectionsengaging said cam faces, a guide on said collet, and means forautomatically shifting said guide into clamping engagement With said diemembers upon rotation of said collet.

3. In a screw-cutting device, a stock provided with cam faces, a colletrotatably mounted in said stock, means for rotating said collet, diemembers slidably mounted in said collet and provided with projectionsengaging said cam faces, a guide threaded in said collet for clampinglyengaging said die-members, and means for locking said guide againstrotation on said stock.

4. In a screw-cutting device, a stock provided With cam faces, a colletrotatably mounted in said stock, means for rotating said collet, diemembers slidably mounted in said collet and provided With projections,means for maintaining said projections in engagement with said camfaces, a guide on said collet, and means for automatically CHARLES C.RUSSELL.

Witnesses CHARLES ALLEN, PERRY C. STEARNS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

